Many possibilities: Longitudinal nail splitting is seen in psoriasis, fungal nail infections, and lichen planus (a relative of psoriasis). A dermatologist can help you pinpoint the cause, and prescribe treatment.
Answered 3/23/2013
5.4k views
Get it checked out: Split nails =onychoschizia, which can occur due to overexposure! Causes may include lack of humidity or prolonged submersion in water or other fluids.
Answered 11/2/2018
254 views
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